Diaphragm tanks are pressurized water vessels where the water and air are separated by a flexible diaphragm allowing the water to expand and absorb pressure surges.

In booster applications, diaphragm tanks can be used on both the discharge and the suction manifold. Connected to the suction manifold a tank serves to counteract fluctuating inlet pressures.

Pressure in low flow periods
Diaphragm tanks are commonly used on the discharge manifold to pressurise the system in very low flow situations where the booster pumps would fail. It decreases the running time of the booster pumps, thereby making the system more energy effective.

Eliminates water hammer
Since the diaphragm is flexible, it is able to adjust to sudden pressure changes, thus counteracting water hammering.

Use diaphragm tanks if…
Building booster sets with stop function should always be mounted with a diaphragm tank. In water supply applications, the elasticity of the piping often gives sufficient capacity and renders diaphragm tanks superfluous.

In areas where inlet pressure fluctuates, diaphragm tanks are often installed on the suction manifold to reduce damaging peak pressures.